The reductive carboxylation of α,β-unsaturated carbonyl compounds with carbon dioxide was studied. After the screening of various transition-metal complex catalysts and reducing agents, it was found that the combination of bis(acetylacetonato)cobalt(II) and diethylzinc could effectively afford the corresponding α-carboxylate in high yield from α,β-unsaturated nitriles. The product was obtained after esterification by trimethylsilyldiazomethane. The highly selective carboxylation was observed at the α-position in the present study.
Cobalt-Catalyzed Reductive Carboxylation of α,β-Unsaturated Compounds with Carbon Dioxide
作者:Chika Hayashi、Takuo Hayashi、Tohru Yamada
DOI:10.1246/bcsj.20150043
日期:2015.6.15
The gaseous carbon dioxide incorporation reaction with α,β-unsaturated compounds was examined in the presence of a catalytic amount of bis(acetylacetonato)cobalt(II) and using diethylzinc as a redu...
在催化量的双(乙酰丙酮)钴 (II) 存在下,并使用二乙基锌作为还原剂,研究了气态二氧化碳与 α,β-不饱和化合物的掺入反应。
A STEREOCONTROLLED SYNTHESIS OF 2-METHYL-2-ALKENENITRILES FROM<i>C</i>-METHYL-<i>C</i>,<i>N</i>-BIS(TRIMETHYLSILYL)KETENIMINE AND ALDEHYDES
作者:Hisashi Okada、Isamu Matsuda、Yusuke Izumi
DOI:10.1246/cl.1983.97
日期:1983.1.5
A stereocontrolled synthesis of 2-methyl-2-alkenenitriles is achieved via the diastereoselective aldol type reaction of C-methyl-C,N-bis(trimethylsilyl)ketenimine with aldehydes in the presence of a mixture of TiCl4 and Ti(O-iPr)4.